The MIRA Safety Geiger-2 is a pocket-sized digital dosimeter and Geiger counter built around the same SBM20-01 Geiger-Mueller tube found in professional-grade radiation detection equipment. Powered by a 400 mAh rechargeable LiPo battery with a 30-day charge life and supplemented by an integrated solar panel, it detects radiation levels from as low as 0.999 μSv/h up to 999 μSv/h. A full-color 1.1-inch LCD, two-button operation, and USB-C charging make it practical for daily carry, emergency preparedness kits, and disaster response scenarios alike.

Who this is for

• Emergency preparedness planners: anyone building a bug-out bag or household disaster kit who needs continuous, real-time radiation awareness after a nuclear incident or industrial accident.
• Everyday carry users: individuals in urban environments who want ongoing background-radiation monitoring during air travel, near medical imaging equipment, or around poorly shielded electronics.
• First responders and professionals: personnel who require a compact, rechargeable dosimeter that tracks long-term cumulative exposure and triggers audible alarms at customizable thresholds.

Detection range and performance

The Geiger-2 uses the SBM20-01 Geiger-Mueller tube — the same tube used in professional-grade counters — to detect alpha particles, beta particles, gamma radiation, and X-rays. It reads radiation levels from 0.999 μSv/h at the low end up to 999 μSv/h at the high end, updating output every 20 seconds as a count rate in counts per second (CPS). That 20-second refresh cycle gives a responsive, real-time picture of ambient conditions without burning through battery capacity.

For long-term tracking, the device stores historical exposure data and lets you set customizable daily exposure limits. When those limits are reached, an audible alarm fires. This combination of real-time monitoring and cumulative dose logging makes the Geiger-2 functional both as an instant-read radiation meter and as a true dosimeter for multi-day field use.

Power system

The internal 400 mAh, 3.7 V LiPo battery delivers a 30-day operational charge under normal use. A full recharge via the included USB-C cable takes approximately two hours. The integrated solar panel provides a supplemental trickle charge that extends battery life during daylight hours — it does not replace USB-C charging, and only indirect sunlight should be used to charge the device through the panel.

Construction and portability

The Geiger-2 is built from impact-resistant polymer and measures only slightly larger than a ballpoint pen. At that size, it fits in a shirt pocket, jacket pocket, purse, or backpack side pouch. The full-color 1.1-inch LCD displays key readings at a glance, and the two-button interface keeps operation straightforward regardless of experience level. In the box: the Geiger-2 unit, a keychain, a carabiner, and a USB-C charging cable. The device operates in temperatures as low as 51°F (10.5°C).

Specifications

Frequently asked questions

What types of radiation does the Geiger-2 detect?

It detects alpha particles, beta particles, gamma radiation, and X-rays using its SBM20-01 Geiger-Mueller tube. The tube ionizes when exposed to radiation and generates an electrical pulse the device counts and displays in real time.

What is the difference between a Geiger counter and a dosimeter?

A Geiger counter measures current radiation levels in real time, while a dosimeter tracks the accumulated dose over a period of time. The Geiger-2 functions as both: it displays live CPS readings and also logs cumulative exposure so you can monitor your total dose across days or weeks.

Can the Geiger-2 detect radiation in water?

Yes. As long as the radiation level falls within the device's 0.999–999 μSv/h measurable range, the Geiger-2 can detect it regardless of the medium.

How long does the battery last and how do I charge it?

The internal LiPo battery lasts 30 days per charge under normal use. Recharging via the included USB-C cable takes approximately two hours. The integrated solar panel extends that 30-day charge in direct sunlight but does not eliminate the need for regular USB-C recharging. Use only indirect sunlight when relying on the solar panel.

Can I set custom radiation alarms?

Yes. The Geiger-2 lets you set customizable daily exposure limits. When the accumulated dose hits that threshold, an audible alarm activates. This feature is particularly useful for users who want a safety ceiling during extended exposure scenarios such as nuclear disaster response or repeated medical imaging.

Is the Geiger-2 reusable long-term?

Yes. It is a fully digital, rechargeable device with no consumable components. The LiPo battery recharges via USB-C, long-term exposure statistics are stored onboard, and power management settings let you optimize battery performance over months and years of continuous use.